Mouse

The mouse has an influence on the control only when it is over the active part of the control, defined by its mouse_mask (default is the entire bounding rectangle of the control).

When on the active area of a control, the mouse has the following behavior:

Mouse Event	Action
Left Click	Acquire focus and start dragging or push (button)
Alt key + Click	Set the value to default (since v1.9.1, the Alt modifier can also be changed to Control instead).
Left Double Click	Acquire focus and (since 1.2.1) launch the fine tuning edit window (except for button):
Right Click	Set the value to default
Mouse Wheel	Increment or decrement the position
Mouse Drag	Change the control position depending on mouse movement (except button)